Carburetor



June 14, 1938. T. STIDHAM 271209342 CARBURETOR Filed Jan. 21, 1937 2 Sheets-Sheet l Inventor I 797 A fiomeys June 14, 1938., T. STIDHAM 2,120,342

CARBURETOR Filed Jan. 21, 1957 2 Sheets-Sheet 2 [nvenior Aiiorne ys Patented June 14, 1938 warren STATES PATENT OFFl-QE 2 Claims.

My invention relates generally to carburetors, and particularly to a carburetor of the downdraft type, and an important object of my invention is to provide a carburetor of this class having means located above or in advance of the air intaking gates which adjustably controls the entrance of the air initially as it is drawn into the carburetor in a manner to produce even, uniform, and accurate opening of the gates, whereby action of the carburetor is improved and economy of fuel effected.

Other important objects of my invention will be apparent from a reading of the following description taken in connection with the drawings, wherein for purposes of illustration I have shown a preferred embodiment of my invention.

In the drawings:-

Figure 1 is a sectional elevational view showing an embodiment of the invention incorporated in a Ford V-8 carburetor of 1933 vintage.

Figure 2 is a transverse vertical sectional View taken through the upper part of Figure 1 and approximately at right angles thereto.

Figure 3 is a group plan View showing the control vanes and their mounting.

Figure 4 is a transverse vertical sectional view taken through Figure 2 approximately on the line 4-4.

Referring in detail to the drawings, the numeral 5 refers generally to the tubular upper part of the carburetor such as used in the 1933 V-8 Ford automobile engine, across the intermediate upper part of which extend arms 6 and l which support the center pillar B in which is mounted the idle adjustment screw 9, otherwise known as the metering pin. The metering pin is mounted in a body which is generally desighated it and which rises above the top of the part 5.

Below the lower end of the pillar 8 is the vertically movable column I l which has a grooved part I 2 operatively engaged with the arms I3 and M which extend laterally from the normally angulated air gates l5, l6 which have springs (not shown) which normally keep them closed and which permit opening action of the gates in proportion to the amount of suction applied to the lower side thereof in the operation of the engine and the inrush of the air coming down through the part 5. All of the parts thus far described are conventional. As is well known, uniformity in the action of the opposed gates l5, l6 under operating conditions of the engine is diiiicult to procure and maintain, with the result that improper functioning of the carburetor and frequent flooding thereof are to be met with in the use of the particular carburetor indicated as well as in other similarly constructed carburetors.

I have discovered that by modifying the movement and direction of travel as well as the volume of the incoming air before it strikes the gates I5, it, that these faults and others may be overcome, and the efficiency and uniformity of action of the carburetor much improved. The means employed by me and exemplified herein comprise the mounting which is generally designated l7 and which consists of a relatively flat thick plate of elongated generally rectangular form and which is provided in its opposite ends with mounting screws l8, l9 situated in notches and 2i, which screws penetrate into the circular opening 22 which is located in the middle of the plate and engage the opposite sides of the portion 23 of the structure which is generally designated Ill and which is located just above the lock nut 24 as illustrated in Figure 4 of the drawings. The opposite longitudinal sides of the said plate have pairs of cars 25, 26 in which are mounted pivots 21 and 28 which are connected to the control vanes 29, 30 by means of pivot barrels 3| and 32, the said barrels being mounted on the top side of the vanes.

Each vane consists of a generally rectangular plate having its outer end rounded as indicated by the numerals 33 and 34 concentric with the curvature of the interior of the upper part of the already mentioned part 5. Approximately centrally penetrating each of the vanes are respective adjusting screws 35, 36 which have lock nuts 31, 38 engaging the tops of the vanes. These screws are so arranged that their inward ends engage the column 8 as indicated in Figure 2 to hold the vanes in the desired adjusted positions. It is obvious that by means of this arrangement the vanes may be given individual adjustment and that they may also be similarly adjusted to different angles to admit or exclude incoming air within their sphere of action, as the air is drawn into the top of the part 5. It is important to note that the vanes 29 and 36 are arranged at 90 degrees with respect to the gates I5, l6, as indicated in Figure 1 of the drawings whereby said vanes are vertically aligned with the gap formed by the opening of the gates.

Although I have shown and described herein a preferred embodiment of my invention, it is to be definitely understood that I do not desire to limit the application of the invention thereto, and any change or changes may be made in the materials,

and in the structure and arrangement of the parts, within the spirit of the invention and the scope of the subjoined claims.

What is claimed as new is:-

1. A carburetor comprising a vertical tube, a metering pin assembly mounted in the upper part of said tube, suction operated air gates swingably mounted in the lower part of said tube and operatively connected to said metering pin assembly, said gates being arranged to swing apart and downwardly to make a gap therebetween when suction is exerted below the gates in said tube whereby a stream of air is indrawn through the upper part of said tube, and air stream modifying means mounted on the upper part of said metering pin assembly, said means comprising declining vanes on opposite sides of said assembly vertically aligned with the gap formed by the opening of the gates, and a support mounted on said assembly to which said vanes are connected, said vanes being adjustably pivoted to said support on horizontal axes.

2. A carburetor comprising a vertical tube, a metering pin assembly mounted in the upper part of said tube, suction operated air gates swingably mounted in the lower part of said tube and operatively connected to said metering pin assembly, said gates being arranged to swing apart and downwardly to make a gap therebetween when suction is exerted below the gates in said tube whereby a stream of air is indrawn through the upper part of said tube, and air stream modifying means mounted on the upper part of said metering pin assembly, said means comprising declining vanes on opposite sides of said assembly, and a support mounted on said assembly to which said vanes are connected, said vanes being vertically aligned with the gap formed by the opening of said gates.

TED STIDI-IAM. 

